package com.smart.community.property.service.impl;

import java.time.LocalDateTime;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.smart.community.commons.result.PageResult;
import com.smart.community.property.entity.PermissionAuditLog;
import com.smart.community.property.mapper.PermissionAuditLogMapper;
import com.smart.community.property.service.IPermissionAuditLogService;

import lombok.extern.slf4j.Slf4j;

/**
 * 权限审计日志服务实现类
 * 
 * 严格按照《Java后端SpringBoot代码开发规范.md》Service层规范实现：
 * - 异常处理规范：使用log.warn记录业务异常，使用log.error记录系统异常
 * - 参数验证：完善的参数验证和错误提示
 * - 业务逻辑：清晰的业务逻辑和错误处理
 * - 性能优化：合理的查询优化和缓存策略
 * - 生产环境标准：符合企业级应用的高可用性、可监控性、可维护性、可扩展性要求
 * 
 * @author Wu.Liang
 * @since 2025-07-01
 * @version 2.0.0 - 生产环境标准优化
 */
@Slf4j
@Service
public class PermissionAuditLogServiceImpl extends ServiceImpl<PermissionAuditLogMapper, PermissionAuditLog> implements IPermissionAuditLogService {

    @Autowired
    private PermissionAuditLogMapper permissionAuditLogMapper;

    @Override
    public boolean recordAuditLog(Long userId, String operation, String target, boolean result, String details) throws Exception {
        try {
            // 参数验证
            if (userId == null) {
                log.warn("记录权限审计日志失败，用户ID不能为空");
                return false;
            }
            if (operation == null || operation.trim().isEmpty()) {
                log.warn("记录权限审计日志失败，操作类型不能为空");
                return false;
            }

            PermissionAuditLog auditLog = new PermissionAuditLog();
            auditLog.setUserId(userId);
            auditLog.setOperation(operation);
            auditLog.setTarget(target);
            // 修正：使用String类型存储结果
            auditLog.setResult(result ? "1" : "0");
            auditLog.setDetails(details);
            auditLog.setIpAddress(getCurrentUserIp());
            auditLog.setUserAgent(getCurrentUserAgent());
            auditLog.setCreateTime(LocalDateTime.now());
            auditLog.setUpdateTime(LocalDateTime.now());

            int insertResult = permissionAuditLogMapper.insert(auditLog);
            if (insertResult > 0) {
                log.debug("权限审计日志记录成功，用户ID: {}, 操作: {}", userId, operation);
                return true;
            } else {
                log.warn("权限审计日志记录失败，用户ID: {}, 操作: {}", userId, operation);
                return false;
            }
        } catch (Exception e) {
            log.warn("记录权限审计日志失败，用户ID: {}, 操作: {}, 错误: {}", userId, operation, e.getMessage());
            return false;
        }
    }

    @Override
    public PermissionAuditLog getAuditLogDetail(Long logId) throws Exception {
        try {
            // 参数验证
            if (logId == null) {
                log.warn("获取权限审计日志详情失败，日志ID不能为空");
                return null;
            }

            PermissionAuditLog auditLog = permissionAuditLogMapper.selectById(logId);
            if (auditLog == null) {
                log.warn("权限审计日志不存在，日志ID: {}", logId);
            }
            return auditLog;
        } catch (Exception e) {
            log.warn("获取权限审计日志详情失败，日志ID: {}, 错误: {}", logId, e.getMessage());
            return null;
        }
    }

    @Override
    public PageResult<PermissionAuditLog> getAuditLogPage(Page<PermissionAuditLog> page, Long userId, 
                                                         String operation, String result, 
                                                         LocalDateTime startTime, LocalDateTime endTime) throws Exception {
        try {
            // 参数验证
            if (page == null) {
                log.warn("分页查询权限审计日志失败，分页参数不能为空");
                return new PageResult<>();
            }

            LambdaQueryWrapper<PermissionAuditLog> wrapper = new LambdaQueryWrapper<>();
            
            if (userId != null) {
                wrapper.eq(PermissionAuditLog::getUserId, userId);
            }
            if (operation != null && !operation.trim().isEmpty()) {
                wrapper.eq(PermissionAuditLog::getOperation, operation);
            }
            // 修正：使用String类型进行比较
            if (result != null && !result.trim().isEmpty()) {
                wrapper.eq(PermissionAuditLog::getResult, result);
            }
            if (startTime != null) {
                wrapper.ge(PermissionAuditLog::getCreateTime, startTime);
            }
            if (endTime != null) {
                wrapper.le(PermissionAuditLog::getCreateTime, endTime);
            }
            
            wrapper.orderByDesc(PermissionAuditLog::getCreateTime);

            IPage<PermissionAuditLog> pageResult = permissionAuditLogMapper.selectPage(page, wrapper);
            
            return new PageResult<PermissionAuditLog>(
                (int) pageResult.getCurrent(),
                (int) pageResult.getSize(),
                pageResult.getTotal(),
                pageResult.getRecords()
            );
        } catch (Exception e) {
            log.warn("分页查询权限审计日志失败，错误: {}", e.getMessage());
            return new PageResult<>();
        }
    }

    @Override
    public List<PermissionAuditLog> getAuditLogsByUserId(Long userId, Integer limit) throws Exception {
        try {
            // 参数验证
            if (userId == null) {
                log.warn("根据用户ID查询权限审计日志失败，用户ID不能为空");
                return Collections.emptyList();
            }

            LambdaQueryWrapper<PermissionAuditLog> wrapper = new LambdaQueryWrapper<>();
            wrapper.eq(PermissionAuditLog::getUserId, userId)
                   .orderByDesc(PermissionAuditLog::getCreateTime)
                   .last(limit != null ? "LIMIT " + limit : "");
            
            return permissionAuditLogMapper.selectList(wrapper);
        } catch (Exception e) {
            log.warn("根据用户ID查询权限审计日志失败，用户ID: {}, 错误: {}", userId, e.getMessage());
            return Collections.emptyList();
        }
    }

    @Override
    public List<PermissionAuditLog> getAuditLogsByOperation(String operation, Integer limit) throws Exception {
        try {
            // 参数验证
            if (operation == null || operation.trim().isEmpty()) {
                log.warn("根据操作类型查询权限审计日志失败，操作类型不能为空");
                return Collections.emptyList();
            }

            LambdaQueryWrapper<PermissionAuditLog> wrapper = new LambdaQueryWrapper<>();
            wrapper.eq(PermissionAuditLog::getOperation, operation)
                   .orderByDesc(PermissionAuditLog::getCreateTime)
                   .last(limit != null ? "LIMIT " + limit : "");
            
            return permissionAuditLogMapper.selectList(wrapper);
        } catch (Exception e) {
            log.warn("根据操作类型查询权限审计日志失败，操作类型: {}, 错误: {}", operation, e.getMessage());
            return Collections.emptyList();
        }
    }

    @Override
    public Map<String, Object> getAuditStatistics(LocalDateTime startTime, LocalDateTime endTime) throws Exception {
        try {
            Map<String, Object> statistics = new HashMap<>();
            
            // 查询总操作次数
            LambdaQueryWrapper<PermissionAuditLog> totalWrapper = new LambdaQueryWrapper<>();
            if (startTime != null) {
                totalWrapper.ge(PermissionAuditLog::getCreateTime, startTime);
            }
            if (endTime != null) {
                totalWrapper.le(PermissionAuditLog::getCreateTime, endTime);
            }
            Integer totalCount = permissionAuditLogMapper.selectCount(totalWrapper);
            
            // 查询成功次数（修正：使用String类型进行比较）
            LambdaQueryWrapper<PermissionAuditLog> successWrapper = new LambdaQueryWrapper<>();
            successWrapper.eq(PermissionAuditLog::getResult, "1");
            if (startTime != null) {
                successWrapper.ge(PermissionAuditLog::getCreateTime, startTime);
            }
            if (endTime != null) {
                successWrapper.le(PermissionAuditLog::getCreateTime, endTime);
            }
            Integer successCount = permissionAuditLogMapper.selectCount(successWrapper);
            
            // 查询失败次数
            Integer failCount = totalCount - successCount;
            
            // 计算成功率
            double successRate = totalCount > 0 ? (double) successCount / totalCount * 100 : 0;
            
            statistics.put("totalCount", totalCount);
            statistics.put("successCount", successCount);
            statistics.put("failCount", failCount);
            statistics.put("successRate", Math.round(successRate * 100.0) / 100.0);
            
            return statistics;
        } catch (Exception e) {
            log.warn("获取权限审计统计信息失败，错误: {}", e.getMessage());
            return new HashMap<>();
        }
    }

    @Override
    public Map<String, Object> getExceptionStatistics(LocalDateTime startTime, LocalDateTime endTime) throws Exception {
        try {
            Map<String, Object> statistics = new HashMap<>();
            
            // 查询失败的操作统计（修正：使用String类型进行比较）
            LambdaQueryWrapper<PermissionAuditLog> wrapper = new LambdaQueryWrapper<>();
            wrapper.eq(PermissionAuditLog::getResult, "0");
            if (startTime != null) {
                wrapper.ge(PermissionAuditLog::getCreateTime, startTime);
            }
            if (endTime != null) {
                wrapper.le(PermissionAuditLog::getCreateTime, endTime);
            }
            
            List<PermissionAuditLog> failedLogs = permissionAuditLogMapper.selectList(wrapper);
            
            // 统计操作类型分布
            Map<String, Long> operationStats = failedLogs.stream()
                .collect(java.util.stream.Collectors.groupingBy(
                    PermissionAuditLog::getOperation,
                    java.util.stream.Collectors.counting()
                ));
            
            statistics.put("totalFailCount", failedLogs.size());
            statistics.put("operationStats", operationStats);
            
            return statistics;
        } catch (Exception e) {
            log.warn("获取权限异常统计信息失败，错误: {}", e.getMessage());
            return new HashMap<>();
        }
    }

    @Override
    public Map<String, Object> getUserOperationStatistics(Long userId, Integer days) throws Exception {
        try {
            // 参数验证
            if (userId == null) {
                log.warn("获取用户权限操作统计失败，用户ID不能为空");
                return new HashMap<>();
            }
            if (days == null || days <= 0) {
                days = 30; // 默认30天
            }

            Map<String, Object> statistics = new HashMap<>();
            
            LocalDateTime startTime = LocalDateTime.now().minusDays(days);
            
            LambdaQueryWrapper<PermissionAuditLog> wrapper = new LambdaQueryWrapper<>();
            wrapper.eq(PermissionAuditLog::getUserId, userId)
                   .ge(PermissionAuditLog::getCreateTime, startTime);
            
            List<PermissionAuditLog> userLogs = permissionAuditLogMapper.selectList(wrapper);
            
            // 统计总操作次数
            long totalOperations = userLogs.size();
            
            // 统计成功操作次数（修正：使用String类型进行比较）
            long successCount = userLogs.stream()
                .filter(log -> "1".equals(log.getResult()))
                .count();
            
            // 统计成功率
            double successRate = userLogs.size() > 0 ? (double) successCount / totalOperations * 100 : 0;
            
            // 按操作类型统计
            Map<String, Long> operationDistribution = userLogs.stream()
                .collect(java.util.stream.Collectors.groupingBy(
                    PermissionAuditLog::getOperation,
                    java.util.stream.Collectors.counting()
                ));
            
            statistics.put("totalOperations", userLogs.size());
            statistics.put("successCount", successCount);
            statistics.put("successRate", Math.round(successRate * 100.0) / 100.0);
            statistics.put("operationDistribution", operationDistribution);
            
            return statistics;
        } catch (Exception e) {
            log.warn("获取用户权限操作统计失败，用户ID: {}, 错误: {}", userId, e.getMessage());
            return new HashMap<>();
        }
    }

    @Override
    public Map<String, Object> getAuditTrendAnalysis(LocalDateTime startTime, LocalDateTime endTime) throws Exception {
        try {
            Map<String, Object> trendData = new HashMap<>();
            
            // TODO: 实现趋势分析
            // 这里可以按天统计操作次数、成功率等趋势数据
            log.info("权限审计日志趋势分析功能待实现");
            
            return trendData;
        } catch (Exception e) {
            log.warn("获取权限审计日志趋势分析失败，错误: {}", e.getMessage());
            return new HashMap<>();
        }
    }

    @Override
    public String exportAuditLogs(Long userId, String operation, String result, 
                                 LocalDateTime startTime, LocalDateTime endTime) throws Exception {
        try {
            log.info("导出权限审计日志，用户ID: {}, 操作类型: {}", userId, operation);
            
            // TODO: 实现导出功能
            // 这里可以调用Excel导出工具类
            log.info("权限审计日志导出功能待实现");
            
            return "audit_logs_export.xlsx";
        } catch (Exception e) {
            log.warn("导出权限审计日志失败，错误: {}", e.getMessage());
            return null;
        }
    }

    @Override
    public boolean batchDeleteAuditLogs(List<Long> logIds) throws Exception {
        try {
            // 参数验证
            if (logIds == null || logIds.isEmpty()) {
                log.warn("批量删除权限审计日志失败，日志ID列表不能为空");
                return false;
            }

            int deleteCount = permissionAuditLogMapper.deleteBatchIds(logIds);
            log.info("批量删除权限审计日志完成，删除数量: {}", deleteCount);
            return deleteCount > 0;
        } catch (Exception e) {
            log.warn("批量删除权限审计日志失败，错误: {}", e.getMessage());
            return false;
        }
    }

    @Override
    public int cleanExpiredLogs(Integer days) throws Exception {
        try {
            // 参数验证
            if (days == null || days <= 0) {
                log.warn("清理过期权限审计日志失败，保留天数必须大于0");
                return 0;
            }

            LocalDateTime expireTime = LocalDateTime.now().minusDays(days);
            
            LambdaQueryWrapper<PermissionAuditLog> wrapper = new LambdaQueryWrapper<>();
            wrapper.lt(PermissionAuditLog::getCreateTime, expireTime);
            
            int deleteCount = permissionAuditLogMapper.delete(wrapper);
            log.info("清理过期权限审计日志完成，清理数量: {}, 保留天数: {}", deleteCount, days);
            return deleteCount;
        } catch (Exception e) {
            log.warn("清理过期权限审计日志失败，错误: {}", e.getMessage());
            return 0;
        }
    }

    /**
     * 获取当前用户IP地址
     * 
     * @return 用户IP地址
     */
    private String getCurrentUserIp() {
        // TODO: 这里应该从请求上下文中获取IP地址
        // 暂时返回默认值
        return "127.0.0.1";
    }

    /**
     * 获取当前用户User-Agent
     * 
     * @return 用户User-Agent
     */
    private String getCurrentUserAgent() {
        // TODO: 这里应该从请求上下文中获取User-Agent
        // 暂时返回默认值
        return "unknown";
    }
} 
